Telephone cabinet



AU 291 EX (No Model.)

P. G. JOHNSUN.

TELEPHONE CABINET.

No. 329,909. Patented Nov. 10, 1885.

' INVBNTOR PATENT OFFICE.

FHAXK (i. JOHNSON, OF .Nl'ld' YORK, X. Y.

TELEPHONE-CABINET.

:':LLLCIFICATIOII forming part ci" Letters Patent 210.329.909, dated November l0, 1885. Application flrcl ["rln'i ary Il. i885. Serial No. 155,801. [No model.)

To ,ZZ whom, it may concern:

Be it known that I, FRANK G. Jonxsox, a citizen of the United States, residing in the city, county, and State of New York, have invented a new and useful Telephone-Gabinet, of which the following is a specification.

It is well known, in the use ofthe telephone, especially in hotels, stores, offices, and other public places, as well as oftentimes iu families, that it is frequently desirable to be able to transmit messages without revealing the purport thereof to others who may be present, and that the want of being able to cniploythe telephone without thus communicating to others what is being transmitted greatly limits the practical usefulness of this valuable instrument.

The objects of my improvement are not only to render it practical to transmit messages through the telephone without' the message being necessarily heard by others who may be in the near presence of the speaker, but at the same time to increase the facility and clearness with which the message itself is transmitted and heard by the eonnnunieants. These objects I attain by means ofa peculiarlyconstructed cabinet', in which the telephone transmitter and receiver are placed, as illus trated by the accompanying drawings, in which- Figure l is a perspective View of the cabinet with its door open and n person standing within; Fig. 2, a transverse section of one corner, embracing also a transverse section of the door, drawn full size as to thickness; and Fig. 3 a transveise section of the entire cabinet. I

Siinilarlel ters refer to s'iinilarparts throughout; the several views.

Each of the sides, door, and top of the eab inet A are made double or triple-that is, of two or three separate walls, a a a, placed apart, leaving suitable spaces between them-which, to further accomplish the desired result, may be filled with suitable brous material, I) b. To admit; light into the cabinet and enablethe occupant to see out,the door B B and the two adjacent sides are provided with glass windows C and C', which are made double, tripla' or, if necessary, quadruple, with spaces between the several panes of glass, as shown in Figs. l and 3. The door l Vlis constructed in the saine manner as the sides of the cabinet., as shown in Figs. 2 and il. The edges ot' the door are made slanting` and convex-gi ng toward the center ofthe cabinet to better admit of its tightly fitting itsaperlnrc in the l'ront wall of the cabinet. The edges of the door and the faces ofthe door-recess in the cabinet are faced with thick leaves of i'ellff.

rlhe object of the double or triple walls a a andthe spaces between them and the fibrous filling b b is to break, and so arrest', the vibrations of sound, and thus deaden the voice ot' the speaker' within iheeabiuet to pers-ous near to and outside nl' the cabinet.

To prevent the sound of the voice within from escapingr through the apertures around the door is the object of the felt innings/"W, and to further prevent an)- escape ot`\'ibra.i ions ofthe voice through tlieaprrtures around the door is the object also of Ille faces of thedoorrecess and the edges ot' the door eoni'erging toward the center ol1 the cabinet. as shown in thescveral drawings, to insure n pressure upon the felt faeingsff by the act ot' closing the door.

To eonuieraetthe non sonni-ons tft'ecll ol' the cabinet, as t-hns far described, (as it relates to the speaker witl1in,) and to render it (the cub inet) more than ordinarily sonorous in ellect S0 far as it relates to aiding thespenlcer within and to the proper and more perfect action ol' the telephoneitself, and to still further-deiulen the voice of the speaker as to persons outside ofthe cabinet, 1 line each sidnof the inside of the cabinet with a sounding-board, l) l), so arranged and attached to the inner walls oi' the cabinet as to leave a space, e c, Fig. 2, between it and the inner wall ol` the eabinetto allow the atmosphere free access` to and acl ion on both sides of it,(the sonndingboard.) This is accomplished, as shown in Figs. 211ml 3, by employing for the solunling-boards thin sonorons walls of wood, and attaching one to each of the inner walls of the cabinet by means of small posts or sl u ds d d d, Fig. 2, and

having a. suitable space around the edges oi' the soundingboards, as shown in Figs. 2 and 3, to admita free circulation of airaronnd the ends and edges and on both sides ofthem.

I do not lmitmyself to any particular shape 

